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Acquisitions - 2018 Acquisitions, Narrative (Details) - USD ($)
shares in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2018
Apr. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]      
Consideration transferred   $ 11.4  
Picatic      
Business Acquisition [Line Items]      
Consideration transferred $ 2.9    
Payments to acquire businesses $ 1.3    
Shares issued as consideration (in shares) 81    
Acquisition costs     $ 0.3
Ticketea      
Business Acquisition [Line Items]      
Payments to acquire businesses   $ 3.6  
Shares issued as consideration (in shares)   700  
Acquisition costs     $ 0.5
Number of shares held in escrow (in shares)   100